...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
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| Number | Title | Issue Date |
| 4276901 | High flow pressure relief valve A fluid pressure relief valve provides automatic venting of a high pressure source to an area of lower pressure in response to pressure build-up of the source. The valve includes a valve body in which a recess is provided, a passage providing communicatio... | 07/07/1981 |